Thanks for your query.Based on the facts that you have posted it appears that you have missed your period by 4 days
Urine test for pregnancy
that you deed twice with different reagents suggest different results and has put you in confusion.
It i is common to get false positive reaction with different agents or even with same reagent
Please repeat the test after one week and if turns out to be positive consult qualified Gynaecologist for examination and further treatment with drugs for abortion
.Do not attempt it yourself as these drugs are known to have complications like excessive bleeding etc.